need help with caps on a plasma tv power supply board

[9302z28ss]

What I need to know is how can I make sure the caps I'm thinking are bad are really bad? And how can I test the entire board to see if there's any info I can get to help fix the issue?

My TV just won't power on it gives me 14 blinks on the front led. Which indicated a power board issue. I replaced two bulging caps already but have two more I need that are bulging and can't find them.

They're 250v 300uf 105c and one 50v 470uf 105c I'm new to circuitry but not to electronics and I'm a fast learner. Need help. Picked up a ESR tester off eBay and that's what I'm using to test my caps.

[Agent24]

Re: need help with caps on a plasma tv power supply board

Digikey or Mouser will have them

[selldoor]

Re: need help with caps on a plasma tv power supply board

First dont post virtually the same question or pointless comments around the forum
it just wastes our time.
I doubt if the 250v cap will have the esr on its data sheet.
Post pictures using manage attachments.
In the stickies in the TV section there is a guide on troubleshooting plasmas by Tom66
Read some of the other threads and see what is needed for us to be able to help you.

[tw2005]

Re: need help with caps on a plasma tv power supply board

What I need to know is how can I make sure the caps I'm thinking are bad are really bad? And how can I test the entire board to see if there's any info I can get to help fix the issue?

My TV just won't power on it gives me 14 blinks on the front led. Which indicated a power board issue. I replaced two bulging caps already but have two more I need that are bulging and can't find them.

They're 250v 300uf 105c and one 50v 470uf 105c I'm new to circuitry but not to electronics and I'm a fast learner. Need help. Picked up a ESR tester off eBay and that's what I'm using to test my caps.

Straight up when I read this there are a few things which cross my mind.

1. You should have this in the TV troubleshooting section.

2. what make and model?

3. Pictures of suspect caps

4. Talking 14 blinks on front LED strongly suggests a panasonic plasma and also S30,St30, GT30 series etc.

If it is the case this is Panasonic of that era, then the 14 blink is a common issue and those higher voltage large caps can give the impression thay are bulged but will be ok.

Shorted out SC board which is shorting Vsus on the PSU will trigger either a locked solid LED or a 14 blink.

If it's not a panasonic then disregard but that's the only make I know with a 14 blink code which suggests PSU as an issue in the fault finding guides and manuals.

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

yes its a panasonic viera tc-p42s30 the light stays solid lid up untill i hold the power button down untill it shuts the light off then i let it go and click it again and thats when i get the 14 blinks, and from what ive seen on youtube (from shopjimmy the tv repair guy) it says if i unplug it and plug it back in and when i hear the first click push the power button and if it blinks its the A board if it stays solid its the Power board, so that why im working on the power board,


i wish i came here first, been dealing with this for freakin weeks and made more progress here then on my own googling

but ill be sure to post this in the TV section, thanks guys

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

http://www.justanswer.com/tv-repair/...18-months.html

heres what i found ill be trying this if i can borrow my cousin in laws multimeter he has a kickass snap on

[selldoor]

Re: need help with caps on a plasma tv power supply board

but ill be sure to post this in the TV section, thanks guys

Dont start ANOTHER thread - click on report this and ask the mods to move it to troubleshooting tv section

Red triangle with exclamation mark

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

ok will do,

[tw2005]

Re: need help with caps on a plasma tv power supply board

yes its a panasonic viera tc-p42s30 the light stays solid lid up untill i hold the power button down untill it shuts the light off then i let it go and click it again and thats when i get the 14 blinks, and from what ive seen on youtube (from shopjimmy the tv repair guy) it says if i unplug it and plug it back in and when i hear the first click push the power button and if it blinks its the A board if it stays solid its the Power board, so that why im working on the power board,


i wish i came here first, been dealing with this for freakin weeks and made more progress here then on my own googling

but ill be sure to post this in the TV section, thanks guys

forget about that SJ video it's inaccurate and misleading. I've already posted remarks to that fact there.

disconnect sn2,ss11,p35 and 3 white ribbons at the A board. Tv should turn on and stay on, no blinks. should be able to confirm the voltages at the psu too.

I helped another guy who followed that video who replaced A and P boards no joy and then I pointed him to the SC board. TV was then fixed.

Or check across SN2 and see if shorted. leave the tV off for a while before hooking those power cables up again to avoid spiking as the caps will hold charge for a while.

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

ok ill try that when i get home, im getting the 14 blink code after i hold the power button for 5 sec does that mean anything or point towards what board it is?

how should i test to see if the SN2 is shorted? what setting do i put the multimeter on setting wise?

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

and is the SC board also known as the SN board?

[tom66]

Re: need help with caps on a plasma tv power supply board

On 42" and 46" panels, yes.

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

sweet, ill check this stuff out when i get home, if this works out ill be grabbing these out of the trash more often!

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

i have another question what if unplugging all of this doesnt allow the tv to come on and stay on? what should i check next?

and if it does come on and stay on what is it i need to replace?

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

so i tried what tw2005 said and nothing, no red led comes on i heard a click when i first plugged the tv in but i cant tell if its doing anything, how will i know?

i tested the P6 connection for 15v i get a 0.00-0.01 on a 20k ohm i get 16.88

when i test P9 on a 20dcv i get 0.00-0.05 on 20kohm i get nothing so its an open circuit? correct?

but now when i try and turn on the TV the red LED comes on then goes right back out and i hear (click click) coming from two relays on the P board, looks like theyre the D702 and D701 or the RL102 and RL101 not sure what numbers belong to these relays but those are the ones around them, im guessing theyre the RL10x numbers, but am i making headway here? i hope so,

also i did change out the C232 cap that used to be a 250v 300uf to a 50v 3300uf i had laying around to see if i could get lucky, and it seems like i did something and make progress???

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

and to add about 15 sec after the first set of clicks form the relays they click again, its acting like it wants to come on

[Agent24]

Re: need help with caps on a plasma tv power supply board

If you're lucky the 50v capacitor won't explode when it sees over 200 volts.

[tom66]

Re: need help with caps on a plasma tv power supply board

also i did change out the C232 cap that used to be a 250v 300uf to a 50v 3300uf i had laying around to see if i could get lucky, and it seems like i did something and make progress???

Why would you do that??

The original capacitor would be a high quality high reliability brand - all Panasonics before 2012 were like this, doing that will just make confetti and possibly destroy other parts when it finally pops!

[tw2005]

Re: need help with caps on a plasma tv power supply board

I would put all the original caps back in, either measure across Sn2 the resistance , see if 0 ohms short or try diode/continuity setting and see if showing short. Maybe you've introduced another fault but really need to eliminate SN board as it's usually that board shorting.

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

i took the other cap out of the p board and someone here lost the dang thing, so i have to hunt around for another or that one here in the house,

but its looking like im not getting any power (or enough power) from the power supply that the power cord plugs into, the P9 connection disconnected from the P board is bouncing from 0.00-0.05 on a 20DCV scale, or am i setting it on too low of a DCV?

ill check for a short on the SN2 and to do that i simply unplug the SN2 connection and probe the connection on a 20k ohm scale?